PH readings are invalid when FC levels are over 10 ppm. You might want to wait on the MA additions until you have an accurate PH reading.
CYA = 0, Pool Greener than grass
- Thread starter txreap
- Start date
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
The good news is I got sucked into some other posts and have not done anything other than test this morning. However, I am confused by your comment regarding shock level. Should I be targeting 24 or some other value? To be sure we're on the same page, the pool is SWG.
Look at the [FC/CYA][/FC/CYA]. Find 30ppm and the corresponding shock level.
It does not matter if it's an swg pool or not at this point. The shock levels are only a function of your CYA.
It does not matter if it's an swg pool or not at this point. The shock levels are only a function of your CYA.
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
6/5 Update, 9PM
Pool is still cloudy, bluish hue. No longer seeing spots on the walls along the water surface (these were the last to go).
FC drops about 50% during the day, very little overnight.
FC 7
CC .5
TA 70
CYA 30
Pool is still cloudy, bluish hue. No longer seeing spots on the walls along the water surface (these were the last to go).
FC drops about 50% during the day, very little overnight.
FC 7
CC .5
TA 70
CYA 30
Sounds like great progress.
The high losses during the day are normal due to the sun.
The high losses during the day are normal due to the sun.
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Day #8 in the books. 6/7, 6:30PM
FC 4. Was 12 at 7:30AM
I should have measured pH while FC was down, but didn't think about it before adding 1.5 ga of CL. 1.5 should put me back at 12. PoolMath hasn't been wrong in this regard. FC has been very steady overnight, so will check pH & CYA before adding more CL tomorrow evening. Water was slightly clearer today, could still make out brush 2.5-3.0 ft under water. Weekends are the worst during SLAM; it's like watching grass grow when waiting for the water to clear.
FC 4. Was 12 at 7:30AM
I should have measured pH while FC was down, but didn't think about it before adding 1.5 ga of CL. 1.5 should put me back at 12. PoolMath hasn't been wrong in this regard. FC has been very steady overnight, so will check pH & CYA before adding more CL tomorrow evening. Water was slightly clearer today, could still make out brush 2.5-3.0 ft under water. Weekends are the worst during SLAM; it's like watching grass grow when waiting for the water to clear.
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Day 10, 9AM
pH 7.2
FC 10
cc .5
Added 1/2 ga of 10% CL, water is cloudy. No doubt it will be sunny day here today, so will test FC more frequently as I should be home most of the day.
pH 7.2
FC 10
cc .5
Added 1/2 ga of 10% CL, water is cloudy. No doubt it will be sunny day here today, so will test FC more frequently as I should be home most of the day.
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Day 10, 11:30AM
Performed test twice to verify readings:
FC 4-5
cc 1.0-1.5
Is this FC loss why progress is minimal during the week? Do I need to be boosting chlorine throughout the day over the weekends?
Performed test twice to verify readings:
FC 4-5
cc 1.0-1.5
Is this FC loss why progress is minimal during the week? Do I need to be boosting chlorine throughout the day over the weekends?
- May 3, 2014
- 59,666
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
When you are in the SLAM process you need to test and dose back to SLAM level as often as possible. If you are trying to do this once a day, the SLAM could last all summer.
During a SLAM, you need to boost FC to SLAM level multiple times a day. Every two hours, if you can manage.
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
No worries, hard during the work week I know! Just hit it hard this weekend, and on work days do as soon as you get up, right before leaving from work, right when you get home, and two hour intervals until bedtime.
Is there anyone that could add liquid chlorine for you during the day?
The TFP "method" definitely understands people have lives away from their pools
The more frequently you can add LC, the quicker the pool will pass SLAM Process (Overnight Chlorine Loss Test)
The most important thing is consistency! Frequency is a close second
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)
Thanks everyone. I tested 5 times throughout the day yesterday. Surprisingly, there was a big drop of the FC from 9:30 to 11:30 A.M, but hourly readings at 2:30 & 3:30 CL stayed at 12+. At 4:30 FC = 10, CC = .5. Then at 7:30 FC was 8, and CC 1. At 11PM, FC was 14, so I expected FC would be at least 10 this morning. As of 8AM today:
FC 5
CC 2
CYA 30
CC seems to change less frequently than FC usually in a range of .5 to 1.5, the 2 this morning was unexpected. Added LQ of 1.255 ga per PoolMath. Some dark spots visible on the wall. I thought they had gone, but maybe that was due to the cloudiness? Will keep an eye on it.
10:30AM
FC 16
CC .5
12:30PM
FC 12
CC 1.0
2:00PM
FC 9
CC 1.0
4:30
FC 5
CC 1.0
6:30PM
FC 15
CC 1.0
10:00PM
FC 16
CC .5
If 12 is the Shock Level with CYA of 30, why not keep it slightly higher than 12 to provide buffer? This is what I did since I knew we were going out this evening and wasn't sure of return time.
FC 5
CC 2
CYA 30
CC seems to change less frequently than FC usually in a range of .5 to 1.5, the 2 this morning was unexpected. Added LQ of 1.255 ga per PoolMath. Some dark spots visible on the wall. I thought they had gone, but maybe that was due to the cloudiness? Will keep an eye on it.
10:30AM
FC 16
CC .5
12:30PM
FC 12
CC 1.0
2:00PM
FC 9
CC 1.0
4:30
FC 5
CC 1.0
6:30PM
FC 15
CC 1.0
10:00PM
FC 16
CC .5
If 12 is the Shock Level with CYA of 30, why not keep it slightly higher than 12 to provide buffer? This is what I did since I knew we were going out this evening and wasn't sure of return time.
Last edited:
CC are always being created as the chlorine breaks stuff down. The CC are further broken down by the chlorine and the Sun. Since overnight there is no sun to break down the CC it does not surprise me that you saw the largest number after overnight.
Just double checking, each time you tested, you bumped the FC/12 back to SLAM Process level correct?
- Apr 29, 2009
- 84
- Pool Size
- 19500
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Hayward Aqua Rite (T-15)